I recently purchased the HD650's and the bass seems surprisingly weak, at least compared to my previous Senns, the excellent HD25-1 Mk II's which are also supposed to be accurate reference monitor phones. This is slightly confusing as the HD650's are almost double the price of the HD25's so I was expecting bass on a par if not better. There's no doubt, even only after 20 or so hours of this apparent 'burn in' stage that the HD650's surpass the HD25's in all other areas giving a beautiful well rounded sound but I'm really surprised by the lack of bass and oomph. I could understand if I was used to a more deliberately bass head pair of phones but the HD25's are supposed to offer an analytical neutral sound and their bass is really powerful compared to the HD650's.
I'm also confused since I heard some complain the bass on the HD650's is a little exaggerated - well I'm getting the exact opposite. Am using them through an RME 9632 sound card and Fii0 E9 amp - do you think the bass will improve over time. Perhaps the HD25's have exaggerated bass after all...?
Edited by aaronnt1 - 10/31/11 at 4:47pm